Transient Deviation of Closed Eyes on Head Torsion. Velosity of Saccadic Deviation.:Velosity of Saccadic Deviation

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Electrooculographically, torsion of the head with closed eyes elicits a transient saccadic deviation (TSD) of about 26° directed to the head torsion.<BR>The velocity of TSD was measured in active and passive head torsions and compared with the velocities of sacades between two targets with 10° and 20° visual angles in 11 normal adults (aged 25 to 49 years).<BR>The mean velocities of TSDs in active and passive maneuvers were 130°/sec and 160°/sec, respectively not a significant difference. The maximum velocities of TSDs were similar to those of saccades shown with 10° visual angle (around 200°/sec). According to the confidence limit and frequency distribution of the velocities of TSDs, the minimum value was thought to be 100°/sec, below which it might suggest a lowered alertness of the parapontine reticular formation (P PRF).<BR>In conclusion, the velocity of TSD may be a valuable indicator of the funct ion of PPRF.
一般社団法人日本めまい平衡医学会の論文